## anonymous 3 years ago Show that: L (\sigma\ i=1 to M c(n)*u(n)) = \sigma\ i=1 to M c(n)L(u(n))

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1. UnkleRhaukus

$L \left(\sum\limits_{i=1}^ M c(n)*u(n)\right) = \sum\limits_{ i=1}^M c(n)L\big(u(n)\big)$? what does the L mean ?